Step ladder



FIG. 1 is perspective view of a first embodiment of the invention;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof, being the mirror of the right side view; and

FIG. 5 is a top view thereof;

FIG. 6 is a perspective view of a second embodiment of the invention;

FIG. 7 is a front view thereof;

FIG. 8 is a rear view thereof;

FIG. 9 is a left side view thereof, being the mirror of the right side view; and

FIG. 10 is a top view thereof; and,

FIG. 11 is a perspective view of a third embodiment of the present invention, the top,left, and rear being substantially consistent with the top, left, and rear of the step ladder of the first embodiment. 

The ornamental design for a step ladder, as shown and described. 